People walk on a bridge across the Grand Canal in Hangzhou, east China's Zhejiang Province, June 18, 2019. June 22 marks the fifth anniversary of the Grand Canal's being listed as a world heritage site. The Grand Canal, almost 3,200 km in total length, is the world's longest man-made waterway, stretching from Beijing to Hangzhou. It has a history of more than 2,500 years. Over 1,000 km of the canal was recognized as a world heritage site in 2014. (Xinhua/Jin Liwang)